diff --git a/script/local.py b/script/local.py
index c534968a..920d4a29 100644
--- a/script/local.py
+++ b/script/local.py
@@ -192,7 +192,7 @@ def create_diag_datasets(parent = None):
         parent = get_current_group()
     group = parent + "attrs/"
     for f in diag_channels:
-        create_dataset(group+get_diag_name(f) , 's' if (type(f) is ch.psi.pshell.epics.ChannelString) else 'i')
+        create_dataset(group+get_diag_name(f) , 's' if (type(f) is ch.psi.pshell.epics.ChannelString) else 'd')
 
 def append_diag_datasets(parent = None):
     if parent is None: